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Analog Devices Inc./Maxim Integrated MAX8865SEUA
- Part No.:
- MAX8865SEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX8865SEUA.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
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Product details
Overview
MAX8865SEUA from Maxim Integrated is a dual, low-dropout linear regulator IC delivering two independent 2.84V outputs (preset mode) or adjustable 1.25V–5.5V outputs (via external resistors), each capable of sourcing up to 100mA. It operates from +2.5V to +5.5V input, features 55mV dropout at 50mA, 105µA no-load supply current, and reverse battery protection - optimized for space-constrained, battery-powered portable devices including cellular phones and modems.
For engineers reviewing the MAX8865SEUA datasheet, MAX8865SEUA pinout, MAX8865SEUA application, or MAX8865SEUA equivalent, key selection criteria include dual independent shutdown control, fixed 2.84V output per channel, µMAX-8 package compatibility, thermal shutdown at +170°C, and support for stable operation with 1µF ceramic output capacitors.
Technical Context
The MAX8865SEUA integrates two independent P-channel MOSFET-based LDO regulators sharing a 1.25V bandgap reference and thermal sensor. Each regulator employs an error amplifier, MOSFET driver, and Dual Mode™ comparator to select between internal fixed-voltage feedback (2.84V) or external resistor-divider-adjustable output (1.25V–5.5V).
Shutdown logic disables individual regulators via active-low SHDN1/SHDN2 pins; in shutdown, supply current drops to 0.16nA (both off). Reverse battery protection limits reverse current to <1mA when VIN or SHDN falls below ground, and thermal shutdown activates at +170°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage (Preset) | 2.84V per channel - factory-trimmed, ±3% tolerance over -40°C to +85°C, enabling direct replacement of 2.8V rails without external components. |
| Dropout Voltage | 55mV @ 50mA - enables regulation down to VIN = VOUT + 55mV, extending usable battery life in Li-ion and NiMH systems. |
| No-Load Supply Current | 105µA - ensures minimal quiescent drain during standby, critical for long-term battery operation in cordless phones and PCMCIA cards. |
| Operating Supply Current | 145µA @ 200mA total load - remains constant across dropout, light, and heavy loads due to PMOS pass transistor architecture. |
| Output Noise | 350µVRMS (10Hz–1MHz) - low enough for powering 12-bit+ ADCs when combined with proper bypassing and layout. |
| Input Voltage Range | +2.5V to +5.5V - supports single-cell Li-ion (3.0–4.2V), 3×NiMH (3.6V), and regulated 3.3V/5V system rails. |
| Thermal Shutdown | +170°C activation with +20°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Reverse Battery Protection | Limits reverse current to <1mA when VIN < GND - prevents battery damage and IC overheating in accidental reverse insertion. |
Pinout & Package
MAX8865SEUA is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 0.8mm, 0.65mm pitch), requiring soldering to large ground pads or PCB ground planes for optimal thermal dissipation (θJA = 244°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 1) | Regulator 1 output | Sources up to 100mA; fixed 2.84V or adjustable via SET1; requires 1µF ceramic bypass to GND for stability. |
| IN (Pin 2) | Input supply | Accepts +2.5V to +5.5V; requires 2µF ceramic bypass to GND near pin for transient immunity. |
| GND (Pin 3) | Power ground | Common return for both regulators and thermal reference; must connect to low-impedance PCB ground plane. |
| OUT2 (Pin 4) | Regulator 2 output | Sources up to 100mA; identical 2.84V preset or adjustable via SET2; independent of OUT1 regulation. |
| SET2 (Pin 5) | Feedback input for OUT2 | Connect to GND for 2.84V output; tie to external R-divider for adjustable mode; threshold <60mV selects internal feedback. |
| SET1 (Pin 6) | Feedback input for OUT1 | Same function as SET2; enables independent configuration of each output (e.g., one fixed, one adjustable). |
| SHDN1 (Pin 7) | Active-low shutdown for OUT1 | Pulling low disables OUT1 and reduces its bias current; does not discharge OUT1 (unlike MAX8866). |
| SHDN2 (Pin 8) | Active-low shutdown for OUT2 | Pulling low disables OUT2 independently; no auto-discharge function - distinguishes MAX8865 from MAX8866. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Each output selectable between factory-trimmed 2.84V or externally adjustable 1.25V–5.5V - eliminates need for separate fixed/adjustable regulators in multi-rail designs. |
| Independent shutdown control | SHDN1 and SHDN2 allow granular power sequencing - e.g., keep RF section active while disabling baseband supply during sleep. |
| Low-noise 350µVRMS output | Enables clean analog supply for precision sensors or audio codecs without additional filtering stages. |
| 145µA operating supply current | Constant across load and dropout conditions - simplifies battery life estimation and avoids hidden current spikes during brownout. |
| Reverse battery protection | Blocks >99% of reverse current (<1mA) when VIN or SHDN pins go negative - prevents field failures in consumer handhelds with user-replaceable batteries. |
| Thermal shutdown with hysteresis | +170°C trip / +150°C recovery - provides self-resetting fault protection during sustained overload without manual reset. |
Applications
| Cellular Telephones | Cordless Telephones |
|---|---|
|
Use Scenario: Powering RF transceiver and baseband processor from a single Li-ion cell with tight voltage margins. IC Role / Device Role / Timing Role: Dual LDO providing isolated, low-noise 2.84V rails for analog front-end and digital core - minimizing cross-talk and supply-induced jitter. Use Value: 55mV dropout extends talk time by ~12 minutes versus higher-dropout alternatives; 350µVRMS noise avoids ADC quantization errors in voice codec paths. |
Use Scenario: Regulating separate 2.84V supplies for handset display backlight and speaker amplifier in DECT handsets. IC Role / Device Role / Timing Role: Independent dual-output LDO enabling selective shutdown of non-critical subsystems during standby. Use Value: 105µA no-load current reduces standby drain to <1µA per rail; independent SHDN pins simplify power-state transitions without firmware overhead. |
| Modems | PCMCIA Cards |
|
Use Scenario: Generating stable 2.84V for VCC_IO and VCC_CORE in embedded DSL or cable modems with mixed-signal ASICs. IC Role / Device Role / Timing Role: Low-noise, high-PSRR LDO supplying analog PHY sections while rejecting switching noise from DC-DC converters. Use Value: 60dB PSRR at 100Hz suppresses ripple from upstream buck converters; 1µF ceramic output caps meet stability requirements without tantalum. |
Use Scenario: Providing dual 2.84V supplies for PCMCIA Type II card logic and interface circuitry in portable laptops. IC Role / Device Role / Timing Role: Space-optimized dual LDO in µMAX-8 package meeting JEDEC MO-187AC footprint constraints. Use Value: 3.05mm × 3.05mm footprint saves >30% board area vs. two discrete SOT-23 LDOs; reverse battery protection prevents damage during hot-swap insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8866SEUA | Identical pinout and preset 2.84V outputs, but adds auto-discharge on shutdown - actively pulls OUT1/OUT2 to GND when SHDN asserted. | Required where rapid output discharge is needed (e.g., to meet USB suspend voltage decay specs or prevent back-powering). | Select MAX8866SEUA only if auto-discharge functionality is explicitly required; otherwise MAX8865SEUA offers lower cost and same regulation performance. |
| TSM1024IDT | Quad 100mA LDO in SO-16; fixed 2.5V/3.3V/5.0V outputs; higher 250µA quiescent current; no reverse battery protection. | Suitable for systems needing more than two rails or higher voltage options, but lacks MAX8865SEUA's ultra-low IQ and reverse-polarity safety. | Choose TSM1024IDT when quad output count outweighs IQ and protection needs; avoid for battery-sensitive or reverse-insertion-prone designs. |
Compared with MAX8866SEUA, MAX8865SEUA omits auto-discharge - reducing complexity and cost where rapid rail collapse isn't mandated. Against TSM1024IDT, MAX8865SEUA delivers 58% lower quiescent current and integrated reverse-battery hardening, making it superior for compact, long-life portable equipment.
Availability
MAX8865SEUA is available at Aetrix Electronics and suitable for cellular telephones, cordless telephones, and modems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8865SEUA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8865SEUA belongs to Maxim's low-dropout linear regulator product line, designed specifically for battery-powered portable electronics demanding ultra-low quiescent current, small footprint, and robust fault protection.
FAQ
What is the output voltage accuracy of the MAX8865SEUA over temperature?
The MAX8865SEUA delivers 2.84V output with ±3% initial accuracy over the full -40°C to +85°C operating range. This specification is guaranteed by production testing and includes drift due to temperature, line, and load variations - ensuring reliable 2.84V rail generation without calibration in cellular telephone and modem applications where MAX8865SEUA is deployed.
Can the MAX8865SEUA be used in adjustable-output mode, and what is the minimum external component count?
Yes, the MAX8865SEUA supports adjustable-output mode via SET1 and SET2 pins. Minimum configuration requires two resistors per channel (R1, R2) forming a voltage divider referenced to the 1.25V internal bandgap. For 2.84V output, R2 = 100kΩ and R1 ≈ 129kΩ yields precise replication of the preset voltage - allowing re-use of existing 2.84V designs with added flexibility using MAX8865SEUA.
Does the MAX8865SEUA provide short-circuit protection, and how does it behave under fault conditions?
Yes, the MAX8865SEUA includes per-channel current limiting that clamps output current to approximately 220mA (120mA min / 320mA max). During sustained short-circuit, the device enters thermal shutdown at +170°C, cycles on/off with 20°C hysteresis, and remains undamaged - enabling safe operation in modems and PCMCIA cards where accidental shorts may occur. MAX8865SEUA does not latch off permanently.
How does the MAX8865SEUA differ from the MAX8866SEUA in shutdown behavior?
The MAX8865SEUA disables its output regulators when SHDN1 or SHDN2 is pulled low but does not discharge the output capacitors. In contrast, the MAX8866SEUA actively sinks current from OUT1/OUT2 to GND during shutdown. This distinction makes MAX8865SEUA suitable for applications where residual output voltage is acceptable post-shutdown, such as in cordless telephone base stations where fast discharge isn't required.
What capacitor values are required for stable operation of the MAX8865SEUA?
Stable operation of the MAX8865SEUA requires a 2µF ceramic capacitor on IN and 1µF ceramic capacitors on each OUT pin. These values ensure phase margin >45° across -40°C to +85°C and 0–100mA load range. Larger output capacitance (e.g., 10µF) improves load-transient response but is not required for basic stability - confirmed by the "Region of Stable COUT ESR vs. Load Current" graph in the MAX8865SEUA datasheet.
MAX8865SEUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (2.84V)
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 0.12V @ 50mA, 0.12V @ 50mA
- Current - Output:
- 100mA, 100mA
- Current - Quiescent (Iq):
- 270 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX8865SEUA FAQ
1.How can I place an order for MAX8865SEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8865SEUA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX8865SEUA reliable?
The price and inventory of MAX8865SEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8865SEUA is usually 5 days.
3.What payment methods are accepted for MAX8865SEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8865SEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8865SEUA?
MAX8865SEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8865SEUA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX8865SEUA?
For technical support, including MAX8865SEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8865SEUA requirements.
6.How does Aetrix verify that MAX8865SEUA is sourced from the original manufacturer or authorized distributors?
All MAX8865SEUA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX8865SEUA meets industry standards.
7.What is the process for return or replacement of MAX8865SEUA?
All MAX8865SEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX8865SEUA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX8865SEUA part is unused and in its original packaging.
Return procedure for MAX8865SEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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